create_pblock pblock_u_ddr3
add_cells_to_pblock [get_pblocks pblock_u_ddr3] [get_cells -quiet [list u_ddr3]]
resize_pblock [get_pblocks pblock_u_ddr3] -add {SLICE_X170Y200:SLICE_X221Y349}
resize_pblock [get_pblocks pblock_u_ddr3] -add {DSP48_X17Y80:DSP48_X19Y139}
resize_pblock [get_pblocks pblock_u_ddr3] -add {RAMB18_X11Y80:RAMB18_X14Y139}
resize_pblock [get_pblocks pblock_u_ddr3] -add {RAMB36_X11Y40:RAMB36_X14Y69}




